JSP Tutorial - JSP Flow Control Statement

JSP if...else

We can use if statement in JavaServer Pages.

The if...else block works as normal if...else statement.

We need to use Scriptlet at each line with HTML text included between Scriptlet tags.

The following code shows how to use the if...else statement with Scriptlet tags.

<%! int day = 7; %> 
<html> 
<body>
<% if (day == 1) { %>
      <p> is one </p>
<% } else { %>
      <p> not one</p>
<% } %>
</body> 
</html>

JSP Switch...case

The following code shows how to use switch...case block

<%! int day = 3; %> 
<html> 
<body>
<% 
switch(day) {
case 0:
   out.println("It\'s Sunday.");
   break;
case 1:
   out.println("It\'s Monday.");
   break;
case 2:
   out.println("It\'s Tuesday.");
   break;
case 3:
   out.println("It\'s Wednesday.");
   break;
case 4:
   out.println("It\'s Thursday.");
   break;
case 5:
   out.println("It\'s Friday.");
   break;
default:
   out.println("It's Saturday.");
}
%>
</body> 
</html>

JSP for loop

The following code shows how to use for loop.


<%! int fontSize; %> 
<html> 
<body>
<%for ( fontSize = 1; fontSize <= 3; fontSize++){ %>
   <font color="red" size="<%= fontSize %>">
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   </font><br />
<%}%>
</body> 
</html>

JSP while loop

The following code shows how to use while loop.

<%! int fontSize; %> 
<html> 
<head><title>WHILE LOOP Example</title></head> 
<body>
<%while ( fontSize <= 3){ %>
   <font color="green" size="<%= fontSize %>">
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   </font><br />
<%fontSize++;%>
<%}%>
</body> 
</html>